64213231 has 2 divisors, whose sum is σ = 64213232. Its totient is φ = 64213230.

The previous prime is 64213213. The next prime is 64213243. The reversal of 64213231 is 13231246.

Together with previous prime (64213213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64213231 - 2¹¹ = 64211183 is a prime.

It is a super-2 number, since 2×64213231² = 8246678070918722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64213211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32106615 + 32106616.

It is an arithmetic number, because the mean of its divisors is an integer number (32106616).

Almost surely, 2^64213231 is an apocalyptic number.

64213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

64213231 is an equidigital number, since it uses as much as digits as its factorization.

64213231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 64213231 is about 8013.3158554995. The cubic root of 64213231 is about 400.4437388076.

Adding to 64213231 its reverse (13231246), we get a palindrome (77444477).

The spelling of 64213231 in words is "sixty-four million, two hundred thirteen thousand, two hundred thirty-one".